Self-closing valve



Patented July 7, 1925.

UNITED sTATEs PATENT OFFICE. l

ELOF KARL HJALMAR LUNDBERG, F SALTSJ'OBADEN, SWEDEN'.

SELF-CLOSING VALVE.

Application led March 187 1924. Serial No. 700,147.

To all 'iv/"wm it may concern.'

Be it known that l, ELor KARL HJALMAR LUNDBERG, a subject ot the `King of Sweden, residing at Saltsjobaden, Sweden, have invented certain new and useful Improvements in Self-Closing Valves, of which the following is a specification.

The self-closing and shock-preventing valve for letting through a predetermined quantity of water (or other liquid), stated in the U. S. Letters Patent No. 1,431,406, comprises, besidesother parts, a diilerential piston, movable in the valve box and contributing to the operation of the valve. The provision of a differential piston, however, has proved unsuitable under certain circumstances, especially when the valve is used for letting through liquids, containing impurities.

For removing the said disadvantage a flexible diaphragm iixed in the valve box, according to this invention has been substituted for the said differential piston, a hollow valve body being lixed to the said diaphragm, which valve body, as the valve is closed, tits tightly to a seat provided in the valve box at the outlet side of the same. ln the said valve body a movable valve spindle is provided, which, when so actuated from the outside, that it moves in the valve body, occupies such a position in the` same, that the lower side of the diaphragm is subjected to a surplus of pressure effected by the liquid in the admission conduit, owing to which' fact the valve body, which normallyT closes the outlet opening of the valve, is automatically moved from its seat, so that the valve is opened. During the last part of the said movement the valve spindle impinges against an abutment provided in the valve box, the position of the same in the valve body being thereby so changed, that the surplus ol pressure on the lower side of the diaphragm ceases, so that the valve body automatically moves towards its seat and the valve. is closed. Through this modification a valve has been attained, which compared with valves of the previous construction possesses essential advantages and is insensible to impurities contained in the liquid.

ln the accompanying drawing a valve according to one form of the invention is shown in vertical section. Figs. 1, 2 and 3 show the principal parts of the valve in three main positions.

The valve box 1 has an inlet 2, an outlet 3 and a valve seat 4. In the valve box a iiexible diaphragm 5 is provided, to which is fixed a hollow valve body 7, which is s0 arranged, that it fits tightly to the seat 4. The diaphragm 5 and the valve body 7 fixed to the same serve as the. lower part of a chamber 6 in the valve box. The valve body 7 has a valve opening 9 and an appertaining valve seat 10 and apertures 11. A valve spindle 12 moves tightly in an opening 13 in the valve body 7 and is provided with an annular projection 14, which tits tightly against a sleeve 15, which is tightly screwed into the valve body 7 and by means of which the diaphragm is fixed to the kvalve body. The lower part of the valve spindle lits tightly against the seat 10, and a downward extension 16 thereof projects down through the valve opening 9. In the valve spindle 12 is arranged a channel 17, from which holes 18 and 19 extend, and in its upper end there is a groove 20.

A cover 21 tightly closes the upper part ot the valve box 1 and between the said cover and the valve box the outer edge of the diaphragm 5 is jammed. In the cover 21 an adjusting screw 22 is screwed.

A. pressure spindle 23 runs in a sleeve on the valve box. rlhe said spindle, after it has been pressed inwards, is restored to its original position by a spring 24. The tip of the inner, conical end 25 of the spindle 23 is situated immediately under the extension 16 of the valve spindle.

The valve box is provided with an inner tubular projection 26, located above t-he valve seat 4 and provided on its inner side with flanges 27 guiding the valve body 7 while moved in the valve box. nels, bounded by the said flanges 27, the tubular projection 26 and the valve body 7, determines the outiiow area of the valve.

The valve acts in the following way. When it is closed, as shown in Fig. 1, there is in the chamber 6 above the diaphragm a pressure equal to the pressure in the water pipe System, owing to the existence of the apertures 11 in the valve body 7 and hole 19 and the channel 17 'in the valve spindle 12. The same pressure also prevails, owing to the occurrence of the channel 17 and the holes 18 in the valve spindle 12, in the hollow part of the valve body 7. By virtue of the tight fit of the valve body 7 against the The chan- J is kept fsf) valve seat 4 and the tight fit of the valve spindle 12 against'zthevalve seat 10 the valve closed. When the valve is to be opened, the spindle 23 is pressed inwards, as shown in Fig. 2. The conical end of the pressure spindle A23 then lifts the valve spindle 12, so that it ceases to fit tightly against the valve seat 10, while on the other hand a tight t between the projection 14 and the sleevell ensues, and this tight fit is maintained by the pressure acting on the annrlar` projection 14. The connection between' the chamber *6 above the diaphragm andl their-let 2 through the hole 19 will then be out off, Vand the liquid above the diaphragm will flow through 'the channel 17, the holes 18 and the now open valve opening' 9y to the outlet 3. The pressure in the chamber `6 above the' diaphragm is Vthereby diminished and as the outflow area of the valve is so adjusted, that sufficient pressure the`A lowe'r sideA of they diaphragm is inaintained, this surplus olf pressure acts in such a way as to bend the' diaphragm upwards and to raise the valve body 7 iixed to the diaphragm. Thereby the tightening;` against the valve seat d .is interrupted andv the liquid Hows thro'ufsph the opening:- at the rvalve seat 4 to the outlet 3'. The valve bod-y 7 with the prcjecti'on 14 of the valve spindle 12 pressed against the sleeve 15, continues to be raised owing' tothe surplus ot pressure below the diaphragm, so that the valve spindle ,12 iiiillyimpingies against the screw 22. The valve sfindl then unable to move further upwarcs, but the pressure on thev lower side of the diaphragm continues to drive the valve body 7 upwards', as the chamber 5* above the diaphragm is still indirect communication with the outlet` 3 through vthe groove 20, the channel 17, the holes 18 and the. valve .opening 9. Consequently, the valve spindle 12 is pushed downwards in relation to the valve' body Z The projection 1 4: is moved Vfrom the sleeve' 15, and

the valve spindle 12 will lit tightly against the seat 1,0 in the valve body 7, as shown in Fig. 3. The chamber 6 above the diaphram is then no longer in communication with the outlet 3, but on the'otherl'iand it is, through the hole 19 and the channel 17 in communi# cation with the inlet 2. The pressure in the chamber G rises and the surplus of pressure on the lower side of the diaphragm ceases, so that the diaphragm is bent downward, according' as the liquid flows into the chamber 6 through the narrow hole 19, owing to which fact the valve body 7 gradually sinks until it fits tightly against the seat 4 in the valve box.

Through the yielding capacity of the diaphragm a shock-free closing is attained.

By raising or lowering the screw 22 the valve is adjusted for allowing a predetermined quantity of liquid to pass through the rlhe invention may be carried out in other ways than that described and illustrated by way ot example.

l claim:y

1. =A self-closing valve? Comprising a cas# ing having a detachable top cap and side walls,anloutlet and an inlet, a valve seat in the casing, a valve comprising a cylindrical valve body of uniform diameter from top to bottom fitting tightly against the said seat in the valve 'casing while the valve is closed, said valve having 'a top cap and a diaphragm clasped between the casing cap and its side walls and between the valve cap and cylindrical body, a valvel spindle in the valve havin-g openings therein and a passage therethrough, a stoppingr device for said spindle said spindle being' movable axially in the valve body, and means to" operate the spindle, the valve body and spindle being so arranged in relation to each other that the valve' spindle alter having been actuated occupies such position in the valve body that the valve is opened by the pressure of the liquid wliereupon, owing to the cooperation ot the valve spindle with said stopping device, the valve spindle is halted 4und brought to occupy such a position in the valve body that the valve is automatically closed after a predetermined quantity of liquid has been let through.

2. A 'self-closing valve comprising a casing having a side wall, a detachable top cap, an inlet and an outlet, a valve seat 1n the casing', a tubular projection extending up wardly within the casing in front of said outlet and a valve in said projection, Said valve havingl la detachable top cap and a cylindrical body portion within the tubular projection and seating on said valve seat, a valve spindle in the valve having; openings therein and passage therethrough, and means to move the same axially oi the valve, and a diaphragm clasped between the valve cap and valve and between the casing' cap and side walls.

IIn testimony whereof l have hereunto aflixed my signature.

ELoF KARL H'JALMAR LUND'BERG. 

